Welcome to the forum!
I believe that this was a community project, where a (large or small) bunch of forum friends come together, create a proposal of parameters for a project (whilst also committing to purchasing the field of that project) and then Sapien decides to make the project. (This is a simplified description of the whole process.)
The project members decide how many copies of their product will be made and, if that project will be available for others outside of the project to purchase it directly upon creation. (I may be wrong but I don’t believe that this product was, at first, offered outside of the project.)
Once a project has been created and sold, the rest of us can buy the product of the project, from the original owners, through the after-market (places like our Official NFT Buying/Selling Thread, the Classified category and outside markets such as Venly).
Hope that helps.